Lubricating device for gas-engines.



F. A. JAHNKE. LUBRIGATING DEVICE FOR GAS ENGINES.

APPLICATION FILED MAR. 25, 1909.

Patented Jan. 11, 1910.

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FRED A. J'AHNKE, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MINNEAPOLIS MOTOR & TRUCK (30., 0F MINNEAPOLIS, MINNESOTA.

LUBRIGATING DEVICE FOR GAS-ENGINES.

Specification of Letters Patent.

Patented Jan'. ,11, 1910.

Application filed March 25, 1909. Serial No.'485,630.

To all whom it may concern.

Be it known that I, FRED A. JAHNKE, of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Lubricating Devices for Gas- Engines, of which the following is a specification.

My invention relates to gas engines and particularly those of the two-cycle type. Generally in gas engines of this type, a pump is employed for the purpose of nitroducing a lubricant into the crank case during the operation of the engine.

The urpose of my invention is to entirely dispense with all pumps and outside means for introducing the lubricating agent, and utilize-the vacuum formed in the crank case to create a suction sufficient todraw the lubricating oil through suitably arranged ducts into the said case.

My invention consists generally in pro-' viding the cylinder of a two-cycle engine with a lubricating duct, communicating through the crank shaft with the wristpins of the piston rod, for the purpose of thoroughly lubricating the bearings duringthe operation of the engine.

In the accompanying drawings, formingpart of this specification, Figure 1 is a detail, sectional view, illustrating the section of a two-cycle engine, Fig. 2 is a view taken on a line substantially at right angles to the section line of Fig. 1.

In the drawing, 2 represents an engine cylinder, having a crank case 3, which communicates with the gas intake pipe from the carbureter through a pipe 4.

A crank shaft 5 is provided in the box 3, on which a pistonrod 6 is mounted having a piston 7 An oil duct 8 is provided in the crank shaft, having branch passages 9,

through which the oil is conducted to the bearing. This passage 8, as indicated in Fig. 2, is extended through the crank of the shaft and terminates opposite the discharge passage of a lubricating duct 11, which extends through the wall of the shaft box and terminates in a bearing 12. A passage 13 leads from the crank case up to the cylinder 2. Gas is admitted to the case 3 from the carbureter and on the compression stroke of the piston, the gas is forced around through the passage 13 into the endv in the crank case will extend through the bearing into the lubricating duct and cause the suction created thereby to draw the oil into the bearin Automatic lubrication "of this bearing willthus take place, without the use of any outside pump or other device, which is usually required in engines of this type.

It is my purpose to apply this invention to a two-cycle engine, where a crank case is employed and where compression followed by suction takes place in said case through the reciprocation of the cylinder piston. The bearings of the piston rods on the crank shaft will be sufficiently loose to allow the suction created by the vacuum in said crank case to draw the oil in said duct into said bearing, substantially as described.

case, the oil being drawn-into said crank case through the formation of the vacuum therein, substantially as described.

2. The combination, with the cylinders of a two-cycle engine, of a crank shaft having bearings, and a lubricating duct communicating with said bearings, said shaft and the crank thereon'having oil passages therethrough arranged to alternately register: with the duct in said bearings, said oil passages having discharge openings, and pis i he miixoinaticaliy drawn into the piston rod tons provided in said cylinders and having honring substantially as described 10 rods and bearings therefor communicating In witnesswhersoi, I have hereunto set with said discharge openings, the vacuum my ham ihis 9$h (iay of February 1909. formed in the crank case by the movement FRED A. JAHNKE.

of the piston extending through the bearing Witnesses: of the piston on the crank to said passage RZCI-IARD PAUL, anci lubricating duct, whereby the oil W111 J. A. BYENGTQN, 

